Three siblings who fatally brawled with a bouncer in an East Village bar when he ordered them to put out a cigarette had blood covering their clothes and shoes when they emerged from the bar, The Post has learned.

The brothers, Jonathan Chan, 29, and Ching “Allan” Chan, 31, were arrested shortly after the fight at Guernica, a Lower East Side nightspot, Sunday morning, as bouncer Dana “Shazam” Blake lay dying from a knife wound that hit a major artery in his leg.

Ngan Ling “Alice” Chan, who was at the club with her brothers, was arrested later at her Chinatown home, where cops found her bloody clothes stashed in a bag, police sources told The Post.

However, all three siblings walked free yesterday after the Manhattan District Attorney’s Office dropped charges against them, saying cops didn’t have enough evidence.

“There are facts and circumstances that we are still investigating,” said district attorney spokeswoman Barbara Thompson.

The fight began after the 200-pound Blake, 32, saw Jonathan, a stockbroker, light up a cigarette in Guernica’s crowded basement and tried to throw him out.

The three siblings who were at the Avenue B bar celebrating a birthday then attacked Blake as he pushed them upstairs to the bar exit, cops said.

But what happened next in the fatal fight is still under investigation.

At some point, Blake was stabbed in the femoral artery and died 11 hours later, but cops have not yet found a weapon.

Cops said one witness claimed to have seen Blake suddenly look startled during the brawl, as if he had just been wounded.

Another witness told cops that as the brothers left the bar, one turned to another bouncer and said, “Look at my face and remember, what happened to him could happen to you.”

But the Chans’ lawyer, Ivan Fisher, said although the siblings admitted to arguing with Blake, they left the club with no idea that he had been injured.

Fisher said Jonathan had decided to ignore the new smoking ban because the bar was so crowded it would have been a big hassle for him to go outside to smoke.

“They are upset that this fellow Shazam died, but the only thing they did was one of them lit a cigarette,” Fisher said.